Fig. 3
From: The effect of cadmium on the growth and antioxidant response for freshwater algae Chlorella vulgaris
Contents of soluble protein, hydrogen peroxide and superoxide anion of C. vulgaris cultivated 18 days. Different lowercase letter (a–c) indicate significant differences between treatments exposed to increasing metal concentration (p < 0.05). Values in columns followed by the same letter(s) are not significantly different according to Tukey’s test (p < 0.05)